Electric machine.



Rm 0 9 1 7 2 nm E nI D E T N T A P S L L I W I R Z 7 3 1 00 n" N ELECTRIC MACHINE.

APPLICATION FILED PEB.8,1905.

[AVE/V7018 T; ovdoxks W'\\\ \S" fl ZQl/ 4 I 41102711 1 EDWARD J. WILLIS, F RICHMOND, VIRGlNlA.

ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Feb. 27,

Application am February a, 1906. Serial No. 244,772.

To' (all whom, it nmy concern.

Be it known that I, EDWARD J; WILLIS, a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Irn rovements in Electric Mahines, of which the following is a specificaion.

This invention relates to improvements in electric machines, especial] polyphase induction-machines,and has or its particular object to provide an improved rotor of the squirrel-cage type in which the bars are bonded by a pluralit of wires wound about the extended ends 0 the cage-bars 'and each secured to' and electrically connected with inafterrnore e'o'mpanying drawing} particularly pointeach end of said bars.

With this and other objects in view the present invention consists in the combination and-'arra ment of'parts, as will be herely described, shown in the aced'out in the appen stood that cha sire, and minor the scope of the claims, it being underes in the form, proportion,

claims without departi from the s irit or sacrificing any of the a yant es 0 the invention.

In t e drawings, Figure 1 is a perspective view of my improved rotor, showing themanner of bonding the'extended ends of the rods forming the "ca e. Fig. 2 is a vertical sectional view of a ent of the rotor, taken one radial line. fi i g. 3 is a fragmentar view of one of the plates forming the lam:- nated body of the rotor and showing the form of the slots and a rod and its insulation shown in transverse section within one of the s ts. 1 Y

. In the preferred embodiment of m invention the rotor-body M is compose( cf the usual laminae, punched, as illustrated in Fig. 3, and mounted upon shaft N to form longitudinal slots 0 of the form shown. Within each of the slots is mounted a 00 per rod P, with the ends R thereof extended lie 'ond the laminated body M and insulated t erefrom by suitable insulating materials S. The extended ends R of the rods P are provided with a plurality of notches T, arranged in circumferential alinement entirely around the cage formed by the extended ends, and in the said notches are arranged a plnralit of naked wires U, preferably arranged spiral y, so that the several windings may be composed of a single wire or they may be composed of a pluetails may be made within several places where the several wires are disposed within the notches the electrical connection is made more perfect by soldering.

It has been found that the lurality of wires used to bond the ends of t e rods of a squirrel-cage rotor offers great resistance to the passage of the induced currents, while from its very 0 en form such an arrangement offers great facility for'cooling. Wl'll e I have shown and described the preferred form of a rotor embodying my invention, it is obvious that numerous changes in the form and prroportion may be made without departing om the spirit of the invention or the scope of the appgriided claims.

1. An element for induction electric inachines, provided with a lurality of rods extending longitudinally yond the ends-of the element and a plurality of bonds consisting of naked wires spaced apart and eidtendin'g entirely around said element u nsaid extended ends and each bond elgrically connected with each rod'at each cdntactpoint.- i

2. An element for induction electric machines provided with a 'lurality of rods extendin 1 longitudinally the b0 y of the element and a-bond extending continuously and spirally a plurality of times entirely around said extended ends and eachcoil of the spiral electrically connected with each of said extended ends adjacent to but se arated from the preceding coil.

3. in element for induction electric machines provided with a plurality of slots formed parallel with the rotor-axis, an insulated rod disposed within each of said slots and extending beyond each end of the body and a bond extendin continuously and s irally a plurality of tunes entirely around t 1e element and each coil of the spiral electrically connected with each of the extended ends adjacent to but not touching the precedin coil.

.4. element for induction electric machines comprisin a laminated body pro: vided with a plum ity of slots formed parallel with the rotor-axis, a rod disposed within each of the said slots and insulated from and extending beyond each end of the said laminated body each of said extended ends l eing provided with a plurality of transverse rality of individual wires. At each of the Having thus descri my invention, what I claimas novel, and desire to secure by Letters Patent, is-.

yond the ends ofnotches disposed in circumferential alinelneut entirely around the cage formed by said extended ends and a plurality of bonds equal in nuinher to the number of notches in .each end of each rod and extending entirely around said element and each disposed \\'1th 1 in and electrically connected at each notch of each slined series.

5. An element for induction electric Inachines comprising a laminated body provided with a plurality of slots formed parallel j with the rotor-axis, a rod disposed within each e. said slots insulated from and extendi inglmyond each end of the said laminated body each of said extended ends being pro- 1 said notches and in electrical connection with said rods.

In testiinoinwhereof I allix my signature in presence of two \vitmsses.

Witnesses:

'1. ll. PERRY, MARY Jonas. 

